Is this related to the widely used project mitm-proxy (http://mitmproxy.org, 10k+ commits & 38k+ ⭐️s on GitHub)? If not, I would really recommend changing the name to avoid confusion. It seems like this uses something called 'allproxy' rather than mitm-proxy, as you'd expected based on the name of this project.
Any chance of supporting mitm-proxy directly? That would be the ideal outcome imo.